The head of Rocky Mount Preparatory School said a math teacher charged with multiple counts of sexual activity with students is no longer working at the school.

“We have fully cooperated with police on this matter and she is no longer an employee of the school,” Todd Pipkin, head of Rocky Mount Prep, told the Telegram.

Erin Elizabeth McAuliffe, 25, was arrested Thursday and charged with three counts of sexual activity with a student and one count of indecent liberties with a minor, Rocky Mount police said in a statement released Friday.

Police say their investigation started on May 5 when administrative staff from Rocky Mount Prep notified police of a possible inappropriate relationship at their campus. The information was related to a math teacher having inappropriate sexually related contact with three juvenile male students off campus, a press release from Rocky Mount police said.

Detectives with the Rocky Mount Police Department began an investigation and interviewed numerous students and faculty of the school before the arrest on Thursday. Rocky Mount police Cpl. Mike Lewis told the Telegram that one of the students was 16 years old and two of the students were 17 years old at the time the incidents occurred.

Pipkin said McAuliffe’s employment at the school ended on May 4, the day before police were called in to investigate.

McAuliffe is being held under a $20,000 bond in the Carteret County jail, with a first appearance in the N.C. District Court in Nashville set for Monday.